Compression Deformation Behavior of AZ91D Magnesium Alloy at Elevated Temperature

2012 ◽  
Vol 184-185 ◽  
pp. 914-919 ◽  
Author(s):  
Yue Sheng Chai ◽  
Yong Zhe Chen ◽  
Wen Feng Liu ◽  
Gang Sun
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Deformation Temperature ◽  
Hot Compression ◽  
Constant Flow ◽  
Compression Tests ◽  
Hot Compression Deformation ◽  
Az91d Magnesium Alloy ◽  
Compression Deformation

Hot compression tests of AZ91D magnesium alloy were performed on Gleeble1500 ranging from 0.001 to 1 s-1 and deformation temperature ranging from 200 to 400°C. The results show that flow stress is dependent on deformation temperature and strain rates．When strain rate is a constant, flow stress decreases with the increasing deformation temperature. Meanwhile, as deformation temperature is a constant, flow stress increases with the increase of strain rate, which can be demonstrated by a Zener-hollomon parameter in the hyperbolic-sine-type equation during hot compression deformation. The hot deformation activation energy is 176.01kJ/mol and the stress exponent is 7.85 during hot compression deformation of AZ91D magnesium alloy.

Compressing Deformation and Microstructure of AZ61 Magnesium Alloy

2014 ◽  
Vol 1015 ◽  
pp. 203-206
Author(s):  
Quan Li ◽  
Jin Yang ◽  
Wen Jun Liu ◽  
Su Qin Luo ◽  
Ren Ju Cheng ◽  
...  
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Deformation Temperature ◽  
Hot Compression ◽  
Compression Tests ◽  
Az61 Magnesium Alloy

Hot compression tests of AZ61 magnesium alloy were performed on gleeble1500D at strain rate ranged in 0.01~1s-1 and deformation temperature 350~400°C.The results show that the flow stress and microstructures strongly depend on the deformation temperature and the strain rate. When the temperature was reduced and the strain rate was enhanced, the area after dynamic recrystallization was enhanced, and the average dynamically recrystallied grain size reduce. But the dynamically recrystallied grain size was not well-proportioned. In this paper the 350°C×1s-1 was suggested.

Hot Compression Deformation Behavior of Spray-Formed AlSn20Cu Alloy

2021 ◽  
Vol 1035 ◽  
pp. 189-197
Author(s):  
Bao Ying Li ◽  
Bao Hong Zhu
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Phase Distribution ◽  
True Stress ◽  
Hot Compression ◽  
Test Machine ◽  
Hot Compression Deformation ◽  
Compression Deformation

The hot deformation behavior of spray-formed AlSn20Cu alloy during hot compression deformation was studied, and the constitutive equation of AlSn20Cu alloy was established. The samples of spray-formed AlSn20Cu alloy were compressed on Gleeble-3500 thermal simulation test machine. The error of the true stress caused by adiabatic heating effect in the experiment was corrected. The constitutive equation of spray-formed AlSn20Cu alloy could be represented by Zener-Hollomon parameter in a hyperbolic sine function. The results showed that the deformation temperatures and strain rates had a notable effect on the true stress of the alloy. At the identical deformation temperature, the true stress increased with the increase of strain rate. When the strain rate was constant, the stress decreased with the increase of deformation temperature. After hot compression deformation, the tin phase was elongated along the direction perpendicular to the compression axis with short strips and blocks. With the increase of deformation temperature and the decrease of strain rate, Sn phase distribution became more homogeneous.

Study of Hot Compression Behavior of ZK60 Magnesium Alloy at Elevated Temperature

2010 ◽  
Vol 154-155 ◽  
pp. 1-10 ◽  
Author(s):  
Yun Bin He ◽  
Qing Lin Pan ◽  
Xiao Yan Liu ◽  
Wen Bin Li
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Deformation Temperature ◽  
True Strain ◽  
Hot Compression ◽  
Compression Behavior ◽  
Zk60 Magnesium Alloy ◽  
Softening Stage

The hot compression behavior of ZK60 magnesium alloy was investigated at the temperatures from 523 to 673K and strain rates from 0.001 to 1s-1 on Gleeble-1500 thermal simulator. The results show that flow stress of ZK60 magnesium alloy decreases with the increase of deformation temperature and the decrease of strain rate. The flow stress curves obtained from experiments can be described in four different stages, i.e., work hardening stage, transition stage, softening stage and steady stage. For higher temperature and lower strain rate, the transition and softening stage are less obvious. The onset of dynamic recrystallization (DRX) occurred before the stress peak in true stress-true strain curves. The critical stress characterizing the onset of DRX rises with the increase of strain rate and/or the decrease of deformation temperature. The constitutive equation of ZK60 magnesium alloy during hot compression was constructed allowing for the effect of true strain on materials constants. The predicted stress-strain curves according to the constitutive equation are in good agreement with experimental results.

Hot Compression Deformation Simulation of AZ61B Magnesium Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 373-377 ◽  
Author(s):  
Pan Xiao ◽  
Tian Mo Liu ◽  
Jian Peng ◽  
Fu Sheng Pan ◽  
Qing Liu
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Hot Compression ◽  
Strain Rates ◽  
Strain Rate Effects ◽  
Hot Compression Deformation ◽  
Compression Deformation ◽  
Rate Effects ◽  
Ebsd Technique ◽  
Stress And Deformation

The hot compression deformation behavior of AZ61B magnesium alloy has been investigated by using a Gleeble-1500D thermal simulator. The samples were compressed to a reduction of 50% at two temperatures (623 and 673K) with different strain rates (0.01, 0.1 and 1s-1). The relationships between flow stress and deformation temperature were analyzed, and the deformation activation energy and stress exponent were calculated based on the experimental results. With aid of the optical microscopy, scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD) techniques, the microstructure and micro-texture of the deformed samples were characterized. The effects of the temperature and strain rates on the hot compression behavior of the AZ61B magnesium alloy have been investigated by detail analyses of the flow stress and microstructural characteristics of the deformed samples. For the 50% compressed samples, dynamic recrystallization occurred during the hot compression. The orientations of the dynamic recrystallized grains with equiaxed shape were investigated by EBSD technique. The relationships among the flow stress, dynamic recovery and recrystallization have been discussed by considering both the temperature and strain rate effects.

scholarly journals Compression Deformation Behavior of AZ81 Magnesium Alloy at Elevated Temperatures

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoping Luo ◽  
Shue Dang ◽  
Li Kang
Keyword(s):  
Activation Energy ◽  
Flow Stress ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Elevated Temperatures ◽  
Compression Deformation ◽  
Deformation Activation Energy

The hot deformation behavior of an AZ81 magnesium alloy was investigated by hot compressive testing on a Gleeble-1500 thermal mechanical simulator in the temperature range from 200 to 400°C and in the strain rate range of 0.001–5 s−1. The relationships among flow stress, strain rate, and deformation temperature were analyzed, and the deformation activation energy and stress exponent were calculated. The microstructure evolution of the AZ81 magnesium alloy under high deformation was examined. The results indicated that the maximum value of the flow stress increased with the decrease of deformation temperature and the increase of strain rate. When the deformation temperature is constant, the flow stress of the AZ81 magnesium alloy increases with the increase of strain rate, which can be demonstrated by a Zener-Hollomon parameter in a hyperbolic-sine-type equation with a hot compression deformation activation energy of 176.01 KJ/mol and basic hot deformation material factorsA,n, andain the analytical expression of the AZ81 magnesium alloy flow stress of3.21227×1014 s−1, 7.85, and 0.00866 MPa, respectively.

Flow Stress Behavior of Al-Fe-V-Si Heat-Resistant Aluminum Alloy Prepared by Spray Forming under Hot-Compression Deformation

2011 ◽  
Vol 704-705 ◽  
pp. 223-228 ◽  
Author(s):  
Ronɡ Hua Zhang ◽  
Yon Gan Zhang ◽  
Bao Hong Zhu
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Strain Rate ◽  
Spray Forming ◽  
True Stress ◽  
Hot Compression ◽  
Hot Compression Deformation ◽  
Heat Resistant ◽  
Compression Deformation ◽  
Deformation Activation Energy

The behavior of the flow stress of Al-Fe-V-Si heat-resistant aluminum alloy prepared by spray forming during hot compression deformation was studied. The results show that the true stress-true strain curves of the spray forming Al-Fe-V-Si heat-resistant alloy are characterized by a high true stress occurrence at the early stage of compression, followed by a steady flowing due to recovery and strain softening because of dynamic recrystallization. The flow stress of the alloy decreases with increasing deforming temperature and increases with increasing strain rate. The flow stress of the spray forming Al-Fe-V-Si heat-resistant aluminum alloy during hot compression deforming can be described by constitutive equation in hyperbolic sine function．The deformation activation energy of the alloy during hot deformation by Sellars-Tegart equation is much higher than those of the conventional aluminum alloy. The deformation activation energy decreases with decreasing strain rate at the beginning, then increases with decreasing strain rate. Keywords：Al-Fe-V-Si alloy；heat-resistant aluminum alloy；hot compression deformation；flow stress

Flow Stress Constitutive Equation of Age Hardening Cu-1.1Cr Alloy during Hot Compression Deformation

2011 ◽  
Vol 213 ◽  
pp. 623-627 ◽  
Author(s):  
Li Zhang ◽  
Ke Xing Song ◽  
Yan Min Zhang ◽  
Qing Wang ◽  
Wei Feng Liu
Keyword(s):  
Flow Stress ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Cold Deformation ◽  
Solution Treatment ◽  
Hot Compression ◽  
Age Hardening ◽  
Hollomon Parameter ◽  
Hot Compression Deformation ◽  
Compression Deformation

The Cu-1.1Cr alloys performed in this paper were prepared by thermal deformation + solution treatment + cold deformation + aging treatment + machining. The flow stress behavior of Cu-1.1Cr alloy was investigated by isothermal compression on Gleeble-1500 hot simulator in the temperature range of 400-800°C and strain rate of 0.01-1s-1. The experimental results indicated that the flow stress of Cu-1.1Cr alloy depends on the strain rate and the deformation temperature. The flow stress increased with increasing strain rates and decreased with increasing temperature. The flow stress of Cu-1.1Cr alloy during hot compression deformation could be represented by Zener-Hollomon parameter including the Arrhenius term. The values of n, α and A in the analytical expressions of flow stress are fitted to be n=15.696, α=0.005178MPa-1 and A =1.289×1021s -1, respectively. The hot deformation activation energy is 346.738kJ/mol. The constitutive equation of the Cu-1.1Cr alloy was obtained .

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